Varun Kumar
Senior Software Developer at Apple
Leander, Texas, United States
Summary
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Rockstar🎓
Top SchoolVarun Kumar is a senior software developer with 14+ years building high-throughput distributed systems and edge platforms, currently engineering at Apple from his base in Leander, Texas. He has led performance and observability improvements at Walmart Global Tech—driving TCP and caching optimizations that cut p99 latency and saved millions in compute—and built cross-datacenter Kafka-based replication and streaming services at MediaMath. A pragmatic polyglot focused on Go and systems work, he contributed stability fixes to the widely used Sarama Kafka client, signaling a strong emphasis on reliability and maintainability in production. Varun combines deep hands-on coding (CI/CD, proxy, caching, tracing) with architecture-level migrations (Go modules, Wasm filters), making him effective at both shipping features and reducing operational friction.
14 years of coding experience
13 years of employment as a software developer
Bachelor of Technology - BTech, Information Technology, Bachelor of Technology - BTech, Information Technology at Uttar Pradesh Technical University
English
Stackoverflow
1,013reputation
245kreached
2answers
31questions
Github Skills (16)
kafka10
apache-kafka10
go10
kafka-node10
concurrency10
kafkajs10
dependency-management9
testing8
git6
html6
css6
api6
compilation6
android6
counter6
Programming languages (13)
Github contributions (5)
IBM/sarama
Jul 2019 - Aug 2020
Sarama is a Go library for Apache Kafka.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 reviews, 6 commits, 55 PRs in 1 year
Contributions summary:Varun primarily contributed to bug fixes and code improvements within the `sarama` library, a Go client for Apache Kafka. Their commits addressed race conditions in consumer group examples, fixed variable names, and resolved declaration dependencies. They also updated dependencies, including the zstd library, and addressed linting issues. The user's work indicates a focus on improving the stability and maintainability of the Kafka client library.
golangsaramaapache-kafkago-libraryapache
varun06/varun06.github.io
Nov 2015 - Dec 2022
Contributions:36 commits, 144 pushes in 7 years 2 months
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